From: Al Viro Date: Tue, 6 Sep 2016 01:42:32 +0000 (-0400) Subject: nfs_write_end(): fix handling of short copies X-Git-Tag: v4.10-rc1~57^2~2^2~5 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=c0cf3ef5e0f47e385920450b245d22bead93e7ad;p=karo-tx-linux.git nfs_write_end(): fix handling of short copies What matters when deciding if we should make a page uptodate is not how much we _wanted_ to copy, but how much we actually have copied. As it is, on architectures that do not zero tail on short copy we can leave uninitialized data in page marked uptodate. Cc: stable@vger.kernel.org Signed-off-by: Al Viro --- diff --git a/fs/nfs/file.c b/fs/nfs/file.c index 9ea85ae23c32..a1de8ef63e56 100644 --- a/fs/nfs/file.c +++ b/fs/nfs/file.c @@ -374,7 +374,7 @@ static int nfs_write_end(struct file *file, struct address_space *mapping, */ if (!PageUptodate(page)) { unsigned pglen = nfs_page_length(page); - unsigned end = offset + len; + unsigned end = offset + copied; if (pglen == 0) { zero_user_segments(page, 0, offset,